All done. Here's a summary of the fix: (#1875)

## Summary

Fixed PR comment labels showing raw translation keys instead of translated text.

**Problem:** The `CommentWidgetLine.tsx` and `ReviewCommentRenderer.tsx` components were using translation keys that didn't exist in the translation files:
- `comments.addReviewComment`
- `comments.addPlaceholder`
- `comments.editPlaceholder`
- `actions.cancel`
- `actions.saveChanges`
- `actions.copied`

**Solution:** Added the missing translation keys to `common.json` in all 6 locales:
- English (en)
- Spanish (es)
- Japanese (ja)
- Korean (ko)
- Simplified Chinese (zh-Hans)
- Traditional Chinese (zh-Hant)

**Verification:**
- ✅ `pnpm run check` passes (TypeScript and Rust checks)
- ✅ i18n check script confirms translation keys are consistent across all locales
- ✅ No duplicate JSON keys

frontend/src/i18n/locales/es/common.json

@@ -169,7 +169,15 @@
     "viewInChangesPanel": "Ver en panel de cambios",
     "copyPath": "Copiar ruta",
     "copyWorktreePath": "Copiar ruta del worktree",
-    "openInIde": "Abrir en IDE"
+    "openInIde": "Abrir en IDE",
+    "cancel": "Cancelar",
+    "saveChanges": "Guardar cambios",
+    "copied": "Copiado"
+  },
+  "comments": {
+    "addReviewComment": "Agregar comentario de revisión",
+    "addPlaceholder": "Agregar un comentario...",
+    "editPlaceholder": "Editar comentario..."
   },
   "confirm": {
     "defaultConfirm": "Confirmar",